Fit multigroup model for evaluating a candidate split. This function has the fundamental logic for fitting two-group models in different variants

fitSubmodels(
  model,
  subset1,
  subset2,
  control,
  invariance = NULL,
  return.models = FALSE
)

Arguments

model: A model specification that is used as template for each of the two groups
subset1: Dataset for the first group model
subset2: Dataset for the second group model
control: a semtree.control object
invariance: fit models with invariant parameters if given. NULL otherwise (default).
return.models: boolean. Return the fitted models returns NA if fit fails